718631 has 4 divisors (see below), whose sum is σ = 725712. Its totient is φ = 711552.

The previous prime is 718621. The next prime is 718633. The reversal of 718631 is 136817.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-718631 is a prime.

It is a super-2 number, since 2×718631² = 1032861028322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 718631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (718633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3386 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (181428).

2⁷¹⁸⁶³¹ is an apocalyptic number.

718631 is a deficient number, since it is larger than the sum of its proper divisors (7081).

718631 is a wasteful number, since it uses less digits than its factorization.

718631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7080.

The product of its digits is 1008, while the sum is 26.

The square root of 718631 is about 847.7210626143. The cubic root of 718631 is about 89.5712529350.

The spelling of 718631 in words is "seven hundred eighteen thousand, six hundred thirty-one".